MCMCB Pro
T42.75XS

T42.75XSAdverse effect of unspecified antiepileptic and sedative-hypnotic drugs, sequela

Billable / specific codeICD-10-CMPOA exempt

T42.75XS is a billable, specific ICD-10-CM code for adverse effect of unspecified antiepileptic and sedative-hypnotic drugs, sequela. It is valid for submission on a claim.

7th character "S" — sequela

The appropriate 7th character is to be added to each code from category T42

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

T42.75XS does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

T42.75XS is named in 8 Medicare coverage policies 8 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

  • A56612Billing and Coding: CT of the Head
  • A56625Billing and Coding: Echocardiography
  • A56625Billing and Coding: Echocardiography
  • A56844Billing and Coding: RAST Type Tests

Related codes at this level

Codes that share T42.75. If T42.75XS is not quite right, the correct code is usually one of these.

Questions about T42.75XS

Is T42.75XS a billable ICD-10-CM code?
Yes. T42.75XS is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T42.75XS sit in the tabular list?
Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.